5-Production-Analysis

Production Analysis unit 5

Sikkim Manipal University 88

Unit 5 Production Analysis

Structure 5.1 Introduction

Objectives

5.2 Meaning of production and production function

5.2.1 Uses of production function

5.2.2 Production function with one variables input case

5.2.3 Production function with two variable input

5.2.4 Long run production function

5.2.5 Economies of scale

5.2.6 Diseconomies of scale

5.2.7 Internalisation of external economies

5.2.8 Externalisation of internal diseconomies

5.2.9 Economies of scope

5.2.10 Diseconomies of scope

Self Assessment Questions 1

5.3 Cost of production

5.3.1 Managerial uses of cost analysis

5.3.2 Different kinds of cost concepts

5.3.3 Determinants of costs

5.3.4 Costoutput relationship

5.3.5 Costoutput relationship and cost curves in the short run

5.3.6 Costout relationship in the long run

Self Assessment Question 2

5.4 Summary

Terminal Questions

Answer to SAQ’s and TQ’s



5.1. Introduction A business firm is an economic unit. It is also called as a production unit. Production is one of the

most important activities of a firm in the circle of economic activity. The main objective of production

is to satisfy the demand for different kinds

of goods and services of the community.

Learning Objectives: After studying this unit, you should be able to understand the following

1. Understand the concept of production, production function and its managerial uses.

2. Analyze short term and long term production function with illustrations.

3. Describe the various dimensions, advantages and demerits of large scale production.

4. Understand the benefits of joint production of one firm rather if it were to be produced by two

different firms.

5. Meaning, different cost concepts and managerial uses of cost of production

6. Understand short run and long run costoutput relationships.

5.2. Meaning Of Production And Production Function The concept of production can be represented in the following manner.

The term “Production” means transformation of physical “Inputs” into physical “Outputs”.

The term “Inputs” refers to all those things or items which are required by the firm to produce a

particular product. Four factors of production are land, labor, capital and organization. In

addition to four factors of production, inputs also include other items like raw materials of all kinds,

power, fuel, water, technology, time and services like transport and communications, warehousing,

marketing, banking, shipping and Insurance etc. It also includes the ability, talents, capacities,

Inputs Transformation

Process Outputs

Exit of Firms

Entry into Firms



knowledge, experience, wisdom of human beings. Thus, the term inputs have a wider meaning in

economics. What we get at the end of productive process is called as “Outputs”. In short, “Outputs”

refer to finished products.

Production always results in either creation of new utilities or addition of values. It is an activity that

increases consumer satiability of goods and services. Production is undertaken by producers and

basically it depends on cost of production. Production analysis is always made in physical terms and

it shows the relationship between physical inputs and physical outputs.

It is to be noted that higher levels of production is an index of progress and growth of an organization

and that of a society. It leads to higher income, employment and economic prosperity. Production of

different types of goods and services in different nations indicates the nature of economic inter

dependence between different nations.

PRODUCTION FUNCTION

The entire theory of production centre round the concept of production function. “A production

Function” expresses the technological or engineering relationship between physical quantity of inputs

employed and physical quantity of outputs obtained by a firm. It specifies a flow of output resulting

from a flow of inputs during a specified period of time. It may be in the form of a table, a graph or an

equation specifying maximum output rate from a given amount of inputs used. Since it relates inputs

to outputs, it is also called as “Inputoutput relation.” The production is purely physical in nature and

is determined by the quantum of technology, availability of equipments, labor, and raw materials, and

so on employed by a firm.

A production function can be represented in the form of a mathematical model or equation as Q = f

(L, N, K….etc) where Q stands for quantity of output per unit of time and L N K etc are the various

factor inputs like land, capital labor etc which are used in the production of output. The rate of output

Q is thus, a function of the factor inputs L N K etc, employed by the firm per unit of time.

Factor inputs are of two types. 1. Fixed Inputs. Fixed inputs are those factors the quantity of which remains constant irrespective of the level of output produced by a firm. For example, land, buildings, machines,

tools, equipments, superior types of labor, top management etc.



2. Variable inputs. Variable inputs are those factors the quantity of which varies with variations in the levels of output produced by a firm For example, raw materials, power, fuel,

water, transport and communication etc.

The distinction between the two will hold good only in the short run. In the long run, all factor inputs

will become variable in nature. Short run is a period of time in which only the variable factors can be varied while fixed factors like plants, machineries, top management etc would remain constant. Time available at

the disposal of a producer to make changes in the quantum of factor inputs is very much limited in

the short run. Long run is a period of time where in the producer will have adequate time to make any sort of changes in the factor combinations.

It is necessary to note that production function is assumed to be a continuous function, i.e. it is

assumed that a change in any of the variable factors produces corresponding changes in the out put.

Generally speaking, there are two types of production functions. They are as follows. 1. Short Run Production Function

In this case, the producer will keep all fixed factors as constant and change only a few variable factor

inputs. In the short run, we come across two kinds of production functions

1. Quantities of all inputs both fixed and variable will be kept constant and only one variable input will

be varied. For example, Law of Variable Proportions.

2. Quantities of all factor inputs are kept constant and only two variable factor inputs are varied. For

example, IsoQuants and Iso Cost curves.

2. Long Run Production Function

In this case, the producer will vary the quantities of all factor inputs, both fixed as well as variable in

the same proportion. For Example, The laws of returns to scale.

Each firm has its own production function which is determined by the state of technology, managerial

ability, organizational skills etc of a firm. If there are any improvements in them, the old production

function is disturbed and a new one takes its place. It may be in the following manner:

1. The quantity of inputs may be reduced while the quantity of output may remain same.

2. The quantity of output may increase while the quantity of inputs may remain same.

3. The quantity of output may increase and quantity of inputs may decrease.



5.2.1 Uses Of Production Function Though production function may appear as highly abstract and unrealistic, in reality, it is both logical

and useful. It is of immense utility to the managers and executives in the decision making process

at the firm level.

There are several possible combinations of inputs and decision makers have to choose the most

appropriate among them. The following are some of the important uses of production function.

1. It can be used to calculate or work out the least cost input combination for a given output or the

maximum outputinput combination for a given cost.

2. It is useful in working out an optimum, and economic combination of inputs for getting a certain

level of output. The utility of employing a unit of variable factor input in the production process can

be better judged with the help of production function. Additional employment of a variable factor

input is desirable only when the marginal revenue productivity of that variable factor input is

greater than or equal to cost of employing it in an organization.

3. Production function also helps in making long run decisions. If returns to scale are increasing, it is

wise to employ more factor units and increase production. If returns to scale are diminishing, it is

unwise to employ more factor inputs & increase production. Managers will be indifferent whether

to increase or decrease production, if production is subject to constant returns to scale.

Thus, production function helps both in the short run and long run decision making process.

5.2.2 Production Function With One Variable Input Case THE LAW OF VARIABLE PROPORTIONS

This law is one of the most fundamental laws of production. It gives us one of the key insights to the

working out of the most ideal combination of factor inputs. All factor inputs are not available in

plenty. Hence, in order to expand the output, scarce factors must be kept constant and variable

factors are to increased in greater quantities. Additional units of a variable factor on the fixed factors

will certainly mean a variation in output. The law of variable proportions or the law of non

proportional output will explain how variation in one factor input give place for variations in outputs.

The law can be stated as the following. As the quantity of different units of only one factor input is increased to a given quantity of fixed factors, beyond a particular point, the marginal, average and total output eventually decline



The law of variable proportions is the new name for the famous “Law of Diminishing Returns” of

classical economists. This law is stated by various economists in the following manner According to

Prof. Benham, “As the proportion of one factor in a combination of factors is increased, after a point, first the marginal and then the average product of that factor will diminish”1. The same

idea has been expressed by Prof.Marshall in the following words. An increase in the quantity of a

variable factor added to fixed factors, at the end results in a less than proportionate increase in the

amount of product, given technical conditions. ASSUMPTIONS OF THE LAW

1. Only one variable factor unit is to be varied while all other factors should be kept constant.

♦ Different units of a variable factor are homogeneous.

♦ Techniques of production remain constant.

♦ The law will hold good only for a short and a given period.

♦ There are possibilities for varying the proportion of factor inputs.



ILLUSTRATION

A hypothetical production schedule is worked out to explain the operation of the law.

Fixed factors = 1 Acre of land + Rs 500000 capital. Variable factor = labor.

Total Product or Output : (TP) It is the output derived from all factors units, both fixed & variable

employed by the producer. It is also a sum of marginal output.

Average Product or Output: (AP). It can be obtained by dividing total output by the number of

variable factors employed.

Marginal Product or Output: (MP) It is the output derived from the employment of an additional unit

of variable factor unit

Units of Variable inputs (Labor)

TP in units

AP in units

MP in units

0 0 0 0

1 10 10 10

2 24 12 14

3 39 13 15

4 52 13 13

5 60 12 8

6 66 11 6

7 70 10 4

8 72 9 2

9 72 8 0

10 70 7 2

I Stage

II Stage

III Stage



Trends in output

From the table, one can observe the following tendencies in the TP, AP, & MP.

1. Total output goes on increasing as long as MP is positive. It is the highest when MP is zero and

TP declines when MP becomes negative.

2. MP increases in the beginning, reaches the highest point and diminishes at the end.

3. AP will also have the same tendencies as the MP. In the beginning MP will be higher than AP but

at the end AP will be higher than MP. Diagrammatic Representation

10

0

10

20

30

40

50

60

70

80

1 2 3 4 5 6 7 8 9 10

No. of Units of variable inputs

Leve

l of O

utpu

t

Series1

Series2

Series3

In the above diagram along with OX axis, we measure the amount of variable factors

employed and along OY axis, we measure TP, AP & MP. From the diagram it is clear that there are

III stages.

Stage Number I. The Law Of Increasing Returns

The total output increases at an increasing rate (More than proportionately) up to the point P

because corresponding to this point P the MP is rising and reaches its highest point. After the point P,

MP decline and as such TP increases gradually.

Stage 1 Stage 2 Stage 3

P

E

TP



The first stage comes to an end at the point where MP curve cuts the AP curve when the AP is

maximum at N.

The I stage is called as the law of increasing returns on account of the following reasons.

1. The proportion of fixed factors is greater than the quantity of variable factors. When the producer

increases the quantity of variable factor, intensive and effective utilization of fixed factors become

possible leading to higher output.

2. When the producer increases the quantity of variable factor, output increases due to the complete

utilization. of the “Indivisible Factors”

3. As more units of the variable factor is employed, the efficiency of variable factors will go up

because it creates more opportunity for the introduction of division of labor and specialization

resulting in higher output.

Stage Number II The Law Of Diminishing Returns

In this case as the quantity of variable inputs is increased to a given quantity of fixed factors, output

increases less than proportionately. In this stage, the T.P increases at a diminishing rate since both

AP & MP are declining but they are positive. The II stage comes to an end at the point where TP is

the highest at the point E and MP is zero at the point B. It is known as the stage of “Diminishing

Returns” because both the AP & MP of the variable factor continuously fall during this stage. It is only

in this stage, the firm is maximizing its total output. Diminishing returns arise due to the following reasons:

1. The proportion of variable factors are greater than the quantity of fixed factors. Hence, both AP & MP decline.

2. Total output diminishes because there is a limit to the full utilization of indivisible factors and introduction of specialization. Hence, output declines.

3. Diseconomies of scale will operate beyond the stage of optimum production. 4. Imperfect substitutability of factor inputs is another cause. Up to certain point substitution is

beneficial. Once optimum point is reached, the fixed factors cannot be compensated by the

variable factor. Diminishing returns are bound to appear as long as one or more factors are fixed

and cannot be substituted by the others.



The III Stage The Stage Of Negative Returns.

In this case, as the quantity of variable input is increased to a given quantity of fixed factors, output

becomes negative. During this stage, TP starts diminishing, AP continues to diminish and MP

becomes negative. The negative returns are the result of excessive quantity of variable factors to a

constant quantity of fixed factors. Hence, output declines. The proverb “Too many cooks spoil the

broth” and “ Too much is too bad” aptly applies to this stage. Generally, the III stage is a theoretical

possibility because no producer would like to come to this stage.

The producer being rational will not select either the stage I (because there is opportunity for him

to increase output by employing more units of variable factor) or the III stage (because the MP is

negative). The stage I & III is described as NONEconomic Region or Uneconomic Region. Hence,

the producer will select the II stage (which is described as the most economic region) where he can

maximize the output. The II stage represents the range of rational production decision. It is clear that in the above example, the most ideal or optimum combination of factor units = 1 Acre of land+ Rs. 5000 00 capital and 9 laborers.

All the 3 stages together constitute the law of variable proportions. Since the second stage is the

most important, in practice we normally refer this law as the law of Diminishing Returns.

PRACTICAL application of the law

1. It helps a producer to work out the most ideal combination of factor inputs or the least cost combination of factor inputs.

2. It is useful to a businessman in the short run production planning at the microlevel. 3. The law gives guidance that by making continuous improvements in science and technology, the

producer can postpone the occurrence of diminishing returns.

5.2.3 Production Function With Two Variable Inputs

ISOQUANTS AND ISO COSTS

The prime concern of a firm is to workout the cheapest factor combinations to produce a given

quantity of output. There are a large number of alternative combinations of factor inputs which can

produce a given quantity of output for a given amount of investment. Hence, a producer has to select

the most economical combination out of them. Isoproduct curve is a technique developed in recent



years to show the equilibrium of a producer with two variable factor inputs. It is a parallel concept to

the indifference curve in the theory of consumption.

MEANING AND DEFINITIONS

The term “Iso –Quant” has been derived from ‘Iso’ meaning equal and ‘Quant’ meaning quantity.

Hence, Iso – Quant is also called as Equal Product Curve or Product Indifference Curve or Constant

Product Curve. An Iso – product curve represents all the possible combinations of two factor inputs

which are capable of producing the same level of output. It may be defined as – “ a curve which

shows the different combinations of the two inputs producing the same level of output .”

Each Iso – Quant curve represents only one particular level of output. If there are different

Iso–Quant curves, they represent different levels of output. Any point on an Iso–Quant curve

represents same level of output. Since each point indicates equal level of output, the producer

becomes indifferent with respect to any one of the combinations.

EQUAL PRODUCT COMBINATION

Combinations Factor X (Labor)

Factor Y Capital

Total Output in units

A 12 1 100

B 8 2 100

C 5 3 100

D 3 4 100

E 2 5 100

In the above schedule, all the five factor combinations will produce the equal level of output,

i.e.100 units. Hence, the producer is indifferent with respect to any one of the combinations

mentioned above.



Graphic Representation

IQ

In the diagram, if we join points ABCDE (which represents different combinations of factor x and y)

we get an Isoquant curve IQ. This curve represents 100 units of output that may be produced by

employing any one of the combinations of two factor inputs mentioned above. It is to be noted that an

IsoProduct Curve shows the exact physical units of output that can be produced by alternative

combinations of two factor inputs. Hence, absolute measurement of output is possible.

Iso – Quant Map

A catalogue of different combinations of inputs with different levels of output can be indicated in a

graph which is called as equal product map or Isoquant map. In other words, a number of Iso Quants representing different amount of out put are known as Isoquant map.

X

Factor Y

Factor X

0 1 2 3 4 5

8

5

3 2

12

•B

•C

•D

•E

•A

Y



Marginal Rate of Technical Substitution (MRTS) It may be defined as the rate at which a factor of production can be substituted for another at the margin without affecting any change in the quantity of output. For example, MRTS of X for

Y is the number of units of factor Y that can be replaced by one unit of factor X quantity of output

remaining the same.

Combinations Factor

X

Factor Y

MRTS of x for y

A 12 1 Nil

B 8 2 4:1

C 5 3 3:1

D 3 4 .2:1

E 2 5 1:1

In the above example, we can notice that in the second combination the producer is

substituting 4 units of X for 1 unit of Y. Hence, in this case MRTS of Y for X is 4:1

Generally speaking, the MRTS will be diminishing. In the above table, we can observe that as

the quantity of factor Y is increased relative to the quantity of X, the number of units of X that will be

required to be replaced by one unit of factor Y will diminish, quantity of output remaining the same.

This is known as the law of Diminishing Marginal Rate of Technical Substitution (DMRTS).

Factor Y Labor

Factor X Capital

X

IQ1

IQ3

IQ2

0

2000 1000

3000

Y



Properties of Iso Quants.

1. An IsoQuant curve slope downwards from left to right.

2. Generally an IsoQuant curve is convex to the origin.

3. No two Isoproduct curves intersect each other.

4. An Isoproduct curve lying to the right represents higher output and viceversa.

5. Always one IsoQuant curve need not be parallel to other.

6. It will not touch either X or Y – axis.

ISOCOST LINE OR CURVE

It is a parallel concept to the budget or price line of the consumer. It indicates the different

combinations of the two inputs which the firm can purchase at given prices with a given outlay. It

shows two things (a) prices of two inputs (b) total outlay of the firm. Each Isocost line will show

various combinations of two factors which can be purchased with a given amount of money at the

given price of each input. We can draw the Isocost line on the basis of an imaginary example.

Let us suppose that a producer wants to spend Rs. 3,000 to purchase factor X and Y. If the price of

X per unit Rs. 100 .00 he can purchase 30 units of X. Similarly if the price of factor Y is Rs. 50. 00

then he can purchase 60 units of Y.

When 30 units of factor X are represented on OY – axis and 60 units of factor Y are represented on

OX axis, we get two points A & B. If we join these two points A and B, then we get the IsoCost line

AB. This line represents the different combinations of factor X and Y that can be purchased with Rs.

3,000.00

Y

0 X B

A

30 Units of Factor X

60 Units of Factor Y

3000=00



The IsoCost line will shift to the right if the producer increase his outlay from Rs. 3,000. 00 to Rs.

4,00000. On the contrary, if his outlay decreases to Rs. 2,000 00, there will be a backward shift in

the position of Isocost line.

The slope of the Isocost line represents the ratio of the price of a unit of factor X to the price of a unit

of factor Y. In case, the price of any one of them changes there would be a corresponding change in

the slope and position of Isocost line.

0

B Q N

PRODUCERS EQUILIBRIUM (Optimum factor combination or least cost combination)

The optimal combination of factor inputs may help in either minimizing cost for a given level of output

or maximizing output with a given amount of investment expenditure. In order to explain

producer’s equilibrium, we have to integrate Isoquant curve with that of Isocost line. Isoproduct

curve represent different alternative possible combinations of two factor inputs with the help of which

a given level of output can be produced. On the other hand, Isocost line shows the total outlay of

the producer and the prices of factors of production.

The intention of the producer is to maximize his profits. Profits can be maximized when he is

producing maximum output with minimum production cost. Hence, the producer selects the least

cost combination of the factor inputs. Maximum output with minimum cost is possible only when he

reaches the position of equilibrium. The position of equilibrium is indicated at the point where Iso

Quant curve is tangential to IsoCost line. The following diagram explains how the producer reaches

the position of equilibrium.

Rs. 4,000/

Rs. 3,000/

Rs. 2,000/

X

Y

M

P

A

Factory X

Y

Factor y



It is quite clear from the diagram that the producer will reach the position of equilibrium at the point E

where the Isoquant curve IQ and Isocost line AB is tangent to each other. With a given total out lay

of Rs. 5,000 the producer will be producing the highest output, i.e. 500 units by employing 25 units of

factors X and 50 units of factor Y. (assuming Rs. 2,500 each is spent on X and Y)

The price of one unit of factor X is Rs.10000 and that of Y is Rs. 5000.. Rs.100 x 25 units of 2500

00 and Rs. 50 x 50 units of Y = 2500 00. He will not reach the position of equilibrium either at the

point E1 and E2 because they are on a higher Isocost line. Similarly, he cannot move to the left side

of E, because they are on a lower IsoCost line and he will not be able to produce 500 units of output

by any combinations which lie to the left of E.

Thus, the point at which the IsoQuant is tangent to the IsoCost line represents the minimum cost or

optimum factor combination for producing a given level of output. At this point, MRTS between the

two points is equal to the ratio between the prices of the inputs.

5.2.4 Long Run Production Function [Change In All Factor Inputs In The Same Proportion] LAWS OF RETURNS TO SCALE

The concept of returns to scale is a long run phenomenon. In this case, we study the change in

output when all factor inputs are changed or made available in required quantity. An increase in scale

means that all factor inputs are increased in the same proportion. In returns to scale, all the

necessary factor inputs are increased or decreased to the same extent so that what ever the scale of

production, the proportion among the factors remains the same.

A

R

IQ

S B N

Factor “Y”

Point of equilibrium Factor “X”

X

•

0

E

Y

M

25 Units

50 Units

E 1

E 2



Three Phases of Returns to Scale

Generally speaking, we study the behavior pattern of output when all factor inputs are increased in

the same proportion under returns to scale. Many economists have questioned the validity of returns

to scale on the ground that all factor inputs cannot be increased in the same proportion and the

proportion between the factor inputs cannot be kept uniform. But in some cases, it is possible that all

factor inputs can be changed in the same proportion and the output is steadied when the input is

doubled or tripled or increased fivefold or tenfold. An ordinary person may think that when the

quantity of inputs is increased 10 times, output will also go up by10 times. But it may or may not

happen as expected.

It may be noted that when the quantity of inputs are increased in the same proportion, the scale of

output or returns to scale may be either more than equal, equal or less than equal. Thus, when the

scale of output is increased, we may get increasing returns, constant returns or diminishing returns.

When the quantity of all factor inputs are increased in a given proportion and output increases more

than proportionately, then the returns to scale are said to be increasing; when the output increases in

the same proportion, then the returns to scale are said to be constant; when the output increases

less than proportionately, then the returns to scale are said to be diminishing.

Sl No. Scale Total Product in Units

Marginal Product in units

1 1 Acre of land + 3 labor 5 5





6 6 Acre of land + 13labor 54 11



It is clear from the table that the quantity of land and labor (Scale) is increasing in the same

proportion, i.e. by 1 acre of land and 2 units of labor through out in our example. The output

increases more than proportionately when the producer is employing 4 acres of land and 9 units of



labor. Output increases in the same proportion when the quantity of land is 5 acres and 11units of

labor and 6 acres of land and 13 units of labor. In the later stages, when he employs 7 & 8 acres of

land and 15 & 17 units of labor, output increases less than proportionately. Thus, one can clearly

understand the operation of the three phases of the laws of returns to scale with the help of the table.

Diagrammatic representation

In the diagram, it is clear that the marginal returns curve slope upwards from A to B, indicating

increasing returns to scale. The curve is horizontal from B to C indicating constant returns to scale

and from C to D, the curve slope downwards from left to right indicating the operation of diminishing

returns to scale.

Y

10

8 III Stage

6

4

2

` | | | | | | | | X

1 2 3 4 5 6 7 8

Factor units Employed

INCREASING RETURNS TO SCALE: Increasing returns to scale is said to operate when the producer is increasing the quantity of all factors [scale] in a given proportion, output increases more than proportionately. For

Marginal R

eturns

A

B C

D

I Rtns

C Rtns

D Rtns

I Stage

II Stage



example, when the quantity of all inputs are increased by 10%, and output increases by 15%, then

we say that increasing returns to scale is operating. In order to explain the operation of this law, an

equal product map has been drawn with the assumption that only two factors X and Y are required.

In the diagram, Factor X is represented along .OX axis and factor Y is represented along OY axis.

The scale line OP is a straight line passing through the origin on the Iso Quant map indicating the

increase in scale as we move upward. The scale line OP represent different quantities of inputs

where the proportion between factor X and factor Y is remains constant. When the scale is

increased from A to B, the return increases from 100 units of output to 200 units. The scale line OP

passing through origin is called as the “Expansion path”. Any line passing through the origin will

indicate the path of expansion or increase in scale with definite proportion between the two factors. It is very clear that the increase in the quantities of factor X and Y [scale] is small as we go up the scale and the output is larger. The distance between each Iso Quant curve is progressively

diminishing. It implies that in order to get an increase in output by another 100 units, a producer is

employing lesser quantities of inputs and his production cost is declining. Thus, the law of increasing

returns to scale is operating

0 Causes for Increasing Returns to Scale

Increasing returns to scale operate in a firm on account of several reasons. Some of the most

important ones are as follows

X

•F •E

•A

•B •C

•D

P

Factor ‘X’ (Labour)

Factor‘Y’ C

apital)

600 500

400 300

200

100

Scale Line



1. Wider scope for the use of latest tools, equipments, machineries, techniques etc to increase

production and reduce cost per unit.

2. Largescale production leads to full and complete utilization of indivisible factor inputs leading to

further reduction in production cost.

3. As the size of the plant increases, more output can be obtained at lower cost.

4. As output increases, it is possible to introduce the principle of division of labor and specialization,

effective supervision and scientific management of the firm etc would help in reducing cost of

operations.

5. As output increases, it becomes possible to enjoy several other kinds of economies of scale like

overhead, financial, marketing and riskbearing economies etc, which is responsible for cost

reduction.

It is important to note that economies of scale outweigh diseconomies of scale in case of increasing

returns to scale. CONSTANT RETURNS TO SCALE Constant returns to scale is operating when all factor inputs [scale] are increased in a given proportion, output also increases in the same proportion. When the quantity of all inputs is

increased by 10%, and output also increases exactly by 10%, then we say that constant returns to

scale are operating.In the diagram, it is clear that the successive Iso Quant curves are equi distant

from each other. Along the scale line OP. It indicates that as the producer increases the quantity of

both factor X and Y in a given proportion, output also increases in the same proportion. Economists

also describe Constant returns to scale as the Linear homogeneous Production function. It shows

that with constant returns to scale, there will be one input proportion which does not change, what

ever may be the level of output.



Causes for Constant Returns to Scale

In case of constant returns to scale, the various internal and external economies of scale are

neutralized by internal and external diseconomies. Thus, when both internal and external economies

and diseconomies are exactly balanced with each other, constant returns to scale will operate.

DIMINISHING RETURNS TO SCALE Diminishing returns to scale is operating when output increases less than proportionately when compared the quantity of inputs used in the production process. For example, when the

quantity of all inputs are increased by 10%, and output increases by 5%, then we say that

diminishing returns to scale is operating.

In the diagram, it is clear that the distance Between each successive Iso Quant curve

Is progressively increasing along the scale line OP it indicates that as the producer is

increasing the quantity of both factor X and Y, in a given proportion, output increases

less than proportionately. Thus, the law of Diminishing returns to scale is operating.

100 units 200 units 300 units

400 units

500 units

Factor ‘X’ (Labour)

Factor ‘Y

’ (Capital)

P

Y

X 0

•A •B

•C •D

•E

Scale Line



Causes for Diminishing Returns to Scale

Diminishing Returns to Scale operate due to the following reasons

1. Emergence of difficulties in coordination and control.

2. Difficulty in effective and better supervision.

3. Delays in management decisions.

4. Inefficient and mismanagement due to over growth and expansion of the firm.

5. Productivity and efficiency declines unavoidably after a point.

Thus, in this case, diseconomies outweigh economies of scale. The result is the operation of

diminishing returns to scale.

The concept of Returns to Scale helps a producer to workout the most desirable

Combination of factor inputs so as to maximize his output and minimize his production cost. It also

helps him, to increase his production, maintain the same level or decrease it depending on the

demand for the product.

P

•A •B

•C •D

•E

•F 600 units

500 units 400 units

300 units 200 units

100 units

Factor ‘Y

’ (Capital)

X

Y

Factor ‘X’ (Labour) 0

Scale Line



5.2.5 Economies Of Scale The study of economies of scale is associated with large scale production. Today there is a general

tendency to organize production on a large scale basis. Mass production of standardized goods has

become the order of the day. Large scale production is beneficial and economical in nature. “The advantages or benefits that accrue to a firm as a result of increase in its scale of production

are called ‘Economies of scale’. They have close relationship with the size of the firm. They

influence the average cost over different ranges of output. They are gain to a firm. They help in

reducing production cost and establishing an optimum size of a firm. Thus, they help a lot and go a

long way in the development and growth of a firm. According to Prof. Marshall these economies are

of two types, viz Internal Economies and External Economics Now we shall study both of them in

detail.

I Internal Economies or Real Economies

Internal Economies are those economies which arise because of the actions of an individual firm to

economize its cost. They arise due to increased division of labor or specialization and complete

utilization of indivisible factor inputs. Prof. Cairncross points out that internal economies are open to a

single factory or a single firm independently of the actions of other firms. They arise on account of an

increase in the scale of output of a firm and cannot be achieved unless output increases. The

following are some of the important aspects of internal economies.

1. They arise “with in” or “inside” a firm.

2. They arise due to improvements in internal factors.

3. They arise due to specific efforts of one firm.

4. They are particular to a firm and enjoyed by only one firm.

5. They arise due to increase in the scale of production.

6. They are dependent on the size of the firm.

7. They can be effectively controlled by the management of a firm.

8. They are called as “Business Secrets “of a firm.



Kinds of Internal Economies. 1. Technical Economies

These economies arise on account of technological improvements and its practical application in the

field of business. Economies of techniques or technical economies are further subdivided into five

heads. a. Economies of superior techniques: These economies are the result of the application of the

most modern techniques of production. When the size of the firm grows, it becomes possible to

employ bigger and better types of machinery. The latest and improved techniques give place for

specialized production. It is bound to be cost reducing in nature. For example, cultivating the land

with modern tractors instead of using age old wooden ploughs and bullock carts, use of computers

instead of human labor etc.

b. Economies of increased dimension: It is found that a firm enjoys the reduction in cost when it

increases its dimension. A large firm avoids wastage of time and economizes its expenditure. Thus,

an increase in dimension of a firm will reduce the cost of production. For example, operation of a

double decker instead of two separate buses. c. Economies of linked process: It is quite possible that a firm may not have various processes of

production with in its own premises. Also it is possible that different firms through mutual agreement

may decide to work together and derive the benefits of linked processes, for example, in diary

farming, printing press, nursing homes etc. d. Economies arising out of research and by products: A firm can invest adequate funds for

research and the benefits of research and its costs can be shared by all other firms. Similarly, a

large firm can make use of its wastes and byproducts in the most economical manner by producing

other products. For example, cane pulp, molasses, and bagasse of sugar factory can be used for

the production of paper, varnish distilleries etc. e. Inventory Economies. Inventory management is a part of better materials management. A big

firm can save a lot of money by adopting latest inventory management techniques. For example,

Just InTime or zero level inventory techniques. The rationale of the JustinTime technique is that

instead of having huge stocks worth of lakhs and crores of rupees, it can ask the seller of the inputs

to supply them just before the commencement of work in the production department each day.



2. Managerial Economies.

They arise because of better, efficient, and scientific management of a firm. Such economies arise in

two different ways. a. Delegation of details The general manager of a firm cannot look after the working of all

processes of production. In order to keep an eye on each production process he has to delegate

some of his powers or functions to trained or specialized personnel and thus relieve himself for co

ordination, planning and executing the plans. This will enable him to bring about improvements in

production process and in bringing down the cost of production. b. Functional Specialization. It is possible to secure economies of large scale production by

dividing the work of management into several separate departments. Each department is placed

under an expert and the rest of the work is left into the hands of specialists. This will ensure better

and more efficient productive management with scientific business administration. This would lead to

higher efficiency and reduction in the cost of production.

3. Marketing or Commercial economies: These economies will arise on account of buying and selling goods on large scale basis at favorable terms. A large firm can buy raw materials and other inputs in bulk at concessional rates.

As the bargaining capacity of a big firm is much greater than that of small firms, it can get quantity

discounts and rebates. In this way economies may be secured in the purchase of different inputs.

A firm can reduce its selling costs also. A large firm can have its own sales agency and channel. The

firm can have a separate selling organization, marketing department manned by experts who are well

versed in the art of pushing the products in the market. It can follow an aggressive sales promotion

policy to influence the decisions of the consumers

4. Financial Economies They arise because of the advantages secured by a firm in mobilizing huge financial resources. A large firm on account of its reputation, name and fame can mobilize huge funds from

money market, capital market, and other private financial institutions at concessional interest rates. It

can borrow from banks at relatively cheaper rates. It is also possible to have large overdrafts from

banks. A large firm can float debentures and issue shares and get subscribed by the general public.

Another advantage will be that the raw material suppliers, machine suppliers etc., are willing to

supply material and components at comparatively low rates, because they are likely to get bulk



orders. Thus, a big firm has an edge over small firms in securing sufficient funds more easily and

cheaply.

5 Labor Economies. These economies will arise as a result of employing skilled, trained, qualified and highly experienced persons by offering higher wages and salaries. As a firm expands, it can employ a

large number of highly talented persons and get the benefits of specialization and division of labor. It

can also impart training to existing labor force in order to raise skills, efficiency and productivity of

workers. New schemes may be chalked out to speed up the work, conserve the scarce resources,

economize the expenditure and save labor time. It can provide better working conditions promotional

opportunities, rest rooms, sports rooms etc, and create facilities like subsidized canteen, crèches for

infants, recreations. All these measures will definitely raise the average productivity of a worker and

reduce the cost per unit output.

6. Transport and Storage Economies They arise on account of the provision of better, highly organized and cheap transport and storage facilities and their complete utilization. A large company can have its own fleet of

vehicles or means of transport which are more economical than hired ones. Similarly, a firm can also

have its own storage facilities which reduce cost of operations.

7. Over Head Economies These economies will arise on account of large scale operations. The expenses on

establishment, administration, bookkeeping, etc, are more or less the same whether production is

carried on small or large scale. Hence, cost per unit will be low if production is organized on large

scale. 8. Economies of Vertical integration A firm can also reap this benefit when it succeeds in integrating a number of stages of production. It secures the advantages that the flow of goods through various stages in production

processes is more readily controlled. Because of vertical integration, most of the costs become

controllable costs which help an enterprise to reduce cost of production.

9. Riskbearing or survival economies These economies will arise as a result of avoiding or minimizing several kinds of risks and uncertainties in a business. A manufacturing unit has to face a number of risks in the business.

Unless these risks are effectively tackled, the survival of the firm may become, difficult. Hence many



steps are taken by a firm to eliminate or to avoid or to minimize various kinds of risks. Generally

speaking, the riskbearing capacity of a big firm will be much greater than that of a small firm. Risk is

avoided when few firms amalgamate or join together or when competition between different firms is

either eliminated or reduced to the minimum or expanding the size of the firm. A large firm secures

riskspreading advantages in either of the four ways or through all of them.

♦ Diversification of output Instead of producing only one particular variety, a firm has to produce

multiple products If there is loss in one item it can be made good in other items.

♦ Diversification of market: Instead of selling the goods in only one market, a firm has to sell its

products in different markets. If consumers in one market desert a product, it can cover the

losses in other markets.

♦ Diversification of source of supply: Instead of buying raw materials and other inputs from only

one source, it is better to purchase them from different sources. If one person fails to supply, a

firm can buy from several sources.

♦ Diversification of the process of manufacture: Instead adopting only one process of

production to manufacture a commodity, it is better to use different processes or methods to

produce the same commodity so as to avoid the loss arising out of the failure of any one process.

II. External Economies or Pecuniary Economies External economies are those economies which accrue to the firms as a result of the expansion in the output of whole industry and they are not dependent on the output level of

individual firms. These economies or gains will arise on account of the over all growth of an

industry or a region or a particular area. They arise due to benefit of localization and specialized

progress in the industry or region. Prof. Stonier & Hague points out that external economies are

those economies in production which depend on increase in the output of the whole industry rather

than increase in the output of the individual firm The following are some of the important aspect of

external economies.

1. They arise ‘outside’ the firm.

2. They arise due to improvement in external factors.

3. They arise due to collective efforts of an industry.

4. They are general, common & enjoyed by all firms.

5. They arise due to overall development, expansion & growth of an industry or a



region.

6. They are dependent on the size of industry.

7. They are beyond the control of management of a firm.

8. They are called as “open secrets “of a firm.

Kinds of External Economies 1. Economies of concentration or Agglomeration They arise because in a particular area a very large number of firms which produce the same

commodity are established. In other words, this is an advantage which arises from what is called

‘Localization of Industry’. The following benefits of localization of industry is enjoyed by all the firms

provision of better and cheap labor at low or reasonable rates, trained educated and skilled labor,

transport and communication, water, power, raw materials financial assistance through private and

public institutions at low interest rates, marketing facilities, benefits of common repairs, maintenance

and service shops, services of specialists or outside experts, better use of by products and other

such benefits. Thus, it helps in reducing the cost of operation of a firm. 2. Economies of Information These economies will arise as a result of getting quick, latest and up to date information from various sources. Another form of benefit that arises due to localization of industry is economies of

information. Since a large number of firms are located in a region, it becomes possible for them to

exchange their views frequently, to have discussions with others, to organize lectures, symposiums,

seminars, workshops, training camps, demonstrations on topics of mutual interest. Revolution in the

field of information technology, expansion in inter net facilities, mobile phones, emails, video

conferences, etc has helped in the free flow of latest information from all parts of the globe in a very

short span of time. Similarly, publication of journals, magazines, information papers etc have helped

a lot in the dissemination of quick information. Statistical, technical and other market information

becomes more readily available to all firms. This will help in developing contacts between different

firms. When interfirm relationship strengthens, it helps a lot to economize the expenditure of a single

firm. 3. Economies of Disintegration These economies will arise as a result of dividing one big unit in to different small units for the sake of convenience of management and administration. When an industry grows beyond a



limit, in that case, it becomes necessary to split it in to small units. New subsidiary units may grow up

to serve the needs of the main industry. For example, in cotton textiles industry, some firms may

specialize in manufacturing threads, a few others in printing, and some others in dyeing and coloring

etc. This will certainly enhance the efficiency in the working of a firm and cut down unit costs

considerably. 4. Economies of Government Action These economies will arise as a result of active support and assistance given by the government to stimulate production in the private sector units. In recent years the government,

in order to encourage the development of private industries have come up with several kinds of

assistance. It is granting taxconcessions, taxholidays, taxexemptions, subsidies, development

rebates financial assistance at low interest rates, etc.

It is quite clear from the above detailed description that both internal and external economies arise on

account of large scale production and they are benefits to a firm and cost reducing in nature. 4. Economies of Physical Factors These economies will arise due to the availability of favorable physical factors and environment. As the size of an industry expands, positive physical environment may to reduce the

costs of all firms working in the industry. For example, Climate, weather conditions, fertility of the soil,

physical environment in a particular place may help all firms to enjoy certain physical benefits. 5. Economies of Welfare These economies will arise on account of various welfare programs under taken by an industry to help its own staff. A big industry is in a better position to provide welfare facilities to the

workers. It may get land at concessional rates and procure special facilities from the local

governments for setting up housing colonies for the workers. It may also establish health care units,

training centers, computer centers and educational institutions of all types. It may grant concessions

to its workers. All these measures would help in raising the overall efficiency and productivity of

workers.

5.2.6 Diseconomies Of Scale

When a firm expands beyond the optimum limit, economies of scale will be converted in to

diseconomies of scale. Over growth becomes a burden. Hence, one should not cross the limit. On

account of diseconomies of scale, more output is obtained at higher cost of production. The following

are some of the main diseconomies of scale



1. Financial diseconomies. . As there is over growth, the required amount of fiancée may not be available to a firm. Consequently, higher interest rates are to be paid for additional funds.

2. Managerial diseconomies Excess growth leads to loss of effective supervision, control

management, coordination of factors of production leading to all kinds of wastages, indiscipline

and rise in production and operating costs. 3. Marketing diseconomies. Unplanned excess production may lead to mismatch between

demand and supply of goods leading to fall in prices. Stocks may pile up, sales may decline

leading to fall in revenue and profits. 4. Technical diseconomies When output is carried beyond the plant capacity, per unit cost will

certainly go up. There is a limit for division of labor and specialization. Beyond a point, they

become negative. Hence, operation costs would go up. 5. Diseconomies of risk and uncertainty bearing. If output expends beyond a limit, investment

increases. The level of inventory goes up. Sales do not go up correspondingly. Business risks

appear in all fields of activities. Supply of factor inputs become inelastic leading to high prices. 6. Labor diseconomies. An unwieldy firm may become impersonal. Contact between labor and

management may disappear. Workers may demand higher wages and salaries, bonus and other

such benefits etc. Industrial disputes may arise. Labor unions may not cooperate with the

management. All of them may contribute for higher operation costs. II External diseconomies. When several business units are concentrated in only place or locality,

it may lead to congestion,, environmental pollution, scarcity of factor inputs like, raw materials, water,

power, fuel, transport and communications etc leading to higher production and operational costs.

Thus, it is very clear that a firm can enjoy benefits of large scale production only up to a limit.

Beyond the optimum limit, it is bound to experience diseconomies of scale. Hence, there should be

proper check on the growth and expansion of a firm.

5.2.7 Internalisation Of External Economies

It implies that a firm will convert certain external benefits created by the government or the entire

society to its own favor with out making any additional investments. A firm may start a new unit in

between two big railway stations or near the air port or near the national high ways or a port so that it

can enjoy all the infrastructure benefits. Similarly, a new computer firm can commence its operations



where there is 24 hours supply of electricity. Hence, they are also called as privatization of public

benefits. Such type of efforts is to be encouraged by the government.

5.2.8 Externalisation Of Internal Diseconomies

In this case, a particular firm on account of its regular operations will pass on certain costs on the

entire society. A firm instead of taking certain precautionary measures by spending some amount of

money will escape and pass on this burden to the government or the society. For example, a firm

may throw chemical or industrial wastes, dirt and filth either to open air or rivers leading to

environmental pollution. In that case, the government is forced to spend more money to clean river

water or prevent environmental pollution. This is a clear case of externalized internal diseconomies. It

is to be avoided at all costs.

5.2.9 Economies Of Scope

It is a common factor to observe that when a singleproduct firm expands its volume of output, it

would enjoy certain economies of scale. As a result, production cost per unit declines and more

output is obtained at lower cost of production. Sometimes they would enjoy certain other external

benefits due to the overall improvements in the entire area or city in which operates. Apart from these

two types of benefits, we also come across another type of benefits in recent years. They are

popularly known as economies of scope. Economies of scope may be defined as those benefits which arise to a firm when it produces more than one product jointly rather than producing two items separately by two different business units. In this case, the benefits of the joint output of a single firm are greater than the

benefits if two products are produced separately by two different firms. Such benefits may arise on

account of joint use of production facilities, joint marketing efforts, or use of the same administrative

office and staff in an organization. Sometimes, production of one product automatically results in the

production of another byproduct leading to a reduction in average cost of production.

Economies of scope results in saving production costs. It can be measured with the help of the

following equation.

C [Q1] + C [ Q2] C [ Q1and Q2]

SC =

C [Q1 and Q2]



Where SC = Saving Cost, C Q1 = cost of producing output Q1, C Q2 = cost of producing outputQ2

and C [Q1, Q2] = joint cost of producing both outputs.

ILLUSTRATION

A firm produces product A & B separately. Cost of producing 100 units of A is Rs. 8000 – 00 and

cost of producing 100 units of B is Rs. 5,00000. If the firm produces both products A & B jointly, in

that case, its total cost would be Rs. 10,000 00.

Now one can find out saving cost by substituting the values to the above mentioned formula.

8,00000 + 5,00000 – 10,00000 3,00000

SC = = = 0.3

10,00000 10,00000

In this case, the joint cost [10,00000] is less than a sum of individual costs [13,00000]. Thus, a firm

can save 3% cost if it produces both products A & B jointly. Hence, the SC is more than zero.

5.2.10 Diseconomies Of Scope Diseconomies of scope may be defined as those disadvantages which occur when cost of producing two products jointly are costlier than producing them individually. In this case, it

would be profitable to produce two goods separately than jointly. For example, with the help of same

machinery, it is not possible to produce two goods together. It involves buying two different

machineries. Hence, production costs would certainly go up in this case.

Difference between Economies of Scale and Economies of Scope

. Economies of scale Economies of scope

1. It is connected with increase or

decrease in scale of production

1. it is connected with increase or

decrease in distribution & marketing.

2. It shows change in output of a single

product

2. it shows a change in output of more

than one products.

3. it is associated with supply side

changes in output.

3. it is associated with demand side

changes in output



4. It indicates savings in cost owing to

increase in volume of output

4. It indicates savings in cost due to

production of more than one product.


1. Production creates _____ or ___ of value.

2. Production function explain ___ or ____ relationship between inputs and outputs.

3. In the short period only ___________ factor inputs are changed.

4. When marginal product is zero toal product will be _________.

5. An ISO _ quant curve shows combination of the inputs which helps to produce same level of

output where as an ISOcost curve shows __ combination of two inputs that can be purchased

with a given that can be purchased with a given investment to prices two factor inputs.

6. When all inputs are increased by 8% and output increases by 13% then its is a case of laws of

____.

7. Internal economic depends on the growth of a ___ and external economics depends on the

growth of the ____.

8. Economic of scope refers to the benefits which arise to a firm when it produces more than

_______ rather than producing more than ________.two items separately by two firms.

5.3 Cost Of Production

Meaning.

Cost is analyzed from the producer’s point of view. Cost estimates are made in terms of money.

Cost calculations are indispensable for management decisions.

In the production process, a producer employs different factor inputs. These factor inputs are to be

compensated by the producer for the services in the production of a commodity. The compensation

is the cost. The value of inputs required in the production of a commodity determines its cost of

output. Cost of production refers to the total money expenses (Both explicit and implicit) incurred by the producer in the process of transforming inputs into outputs. In short, it refers

total money expenses incurred to produce a particular quantity of output by the producer. The

knowledge of various concepts of costs, costoutput relationship etc. occupies a prominent place in

cost analysis.



5.3.1 Managerial Uses Of Cost Analysis

A detailed study of cost analysis is very useful for managerial decisions. It helps the management –

1. To find the most profitable rate of operation of the firm.

2. To determine the optimum quantity of output to be produced and supplied.

3. To determine in advance the cost of business operations.

4. To locate weak points in production management to minimize costs.

5. To fix the price of the product.

6. To decide what sales channel to use.

7. To have a clear understanding of alternative plans and the right costs involved in

them.

8. To have clarity about the various cost concepts.

9. To decide and determine the very existence of a firm in the production field.

10. To regulate the number of firms engaged in production.

11. To decide about the method of cost estimation or calculations.

12. To find out decision making costs by reclassifications of elements, reprising of input factors etc,

so as to fit the relevant costs into management planning, choice etc.

5.3.2 Different Kinds Of Cost Concepts. 1. Money Cost and Real Cost When cost is expressed in terms of money, it is called as money cost It relates to money outlays by a firm on various factor inputs to produce a commodity. In a monetary economy, all

kinds of cost estimations and calculations are made in terms of money only. .Hence, the knowledge

of money cost is of great importance in economics. Exact measurement of money cost is possible. When cost is expressed in terms of physical or mental efforts put in by a person in the making of a product, it is called as real cost. It refers to the physical, mental or psychological

efforts, the exertions, sacrifices, the pains, the discomforts, displeasures and inconveniences which

various members of the society have to undergo to produce a commodity. It is a subjective And

relative concept and hence exact measurement is not possible.



2. Implicit or Imputed Costs and Explicit Costs

Explicit costs are those costs which are in the nature of contractual payments and are paid by an entrepreneur to the factors of production [excluding himself] in the form of rent, wages, interest and profits, utility expenses, and payments for raw materials etc. They can be

estimated and calculated exactly and recorded in the books of accounts.

Implicit or imputed costs are implied costs. They do not take the form of cash outlays and as such do

not appear in the books of accounts. They are the earnings of owneremployed resources. For

example, the factor inputs owned by the entrepreneur himself like capital can be utilized by himself or

can be supplied to others for a contractual sum if he himself does not utilize them in the business. It

is to be remembered that the total cost is a sum of both implicit and explicit costs.

3. Actual costs and Opportunity Costs

Actual costs are also called as outlay costs, absolute costs and acquisition costs. They are those

costs that involve financial expenditures at some time and hence are recorded in the books of

accounts. They are the actual expenses incurred for producing or acquiring a commodity or service by a firm. For example, wages paid to workers, expenses on raw materials, power, fuel and

other types of inputs. They can be exactly calculated and accounted without any difficulty. Opportunity cost of a good or service is measured in terms of revenue which could have been earned by employing that good or service in some other alternative uses. In other words, opportunity cost of anything is the cost of displaced alternatives or costs of sacrificed alternatives. It implies that opportunity cost of anything is the alternative that has been foregone. Hence, they

are also called as alternative costs. Opportunity cost represents only sacrificed alternatives. Hence,

they can never be exactly measured and recorded in the books of accounts.

The knowledge of opportunity cost is of great importance to management decision. They help in

taking a decision among alternatives. While taking a decision among several alternatives, a manager

selects the best one which is more profitable or beneficial by sacrificing other alternatives. For

example, a firm may decide to buy a computer which can do the work of 10 laborers. If the cost of

buying a computer is much lower than that of the total wages to be paid to the workers over a period

of time, it will be a wise decision. On the other hand, if the total wage bill is much lower than that of

the cost of computer, it is better to employ workers instead of buying a computer. Thus, a firm has to

take a number of decisions almost daily.



4. Direct costs and indirect costs Direct costs are those costs which can be specifically attributed to a particular product, a department, or a process of production. For example, expenses on raw materials, fuel, wages to

workers, salary to a divisional manager etc are direct costs. On the other hand, indirect costs are

those costs, which are not traceable to any one unit of operation. They cannot be attributed to a

product, a department or a process. For example, expenses incurred on electricity bill, water bill,

telephone bill, administrative expeneses etc.

5. Past and future costs.

Past costs are those costs which are spent in the previous periods. On the other hand, future costs

are those which are to be spent. in the future. Past helps in taking decisions for future.

6. Marginal and Incremental costs Marginal cost refers to the cost incurred on the production of another or one more unit .It implies additional cost incurred to produce an additional unit of output It has nothing to do with fixed

cost and is always associated with variable cost.

Incremental cost on the other hand refers to the costs involved in the production of a batch or group

of output. They are the added costs due to a change in the level or nature of business activity. For

example, cost involved in the setting up of a new sales depot in another city or cost involved in the

production of another 100 extra units.

7. Fixed costs and variable costs. Fixed costs are those costs which do not vary with either expansion or contraction in output. They remain constant irrespective of the level of output. They are positive even if there is no

production. They are also called as supplementary or over head costs.

On the other hand, variable costs are those costs which directly and proportionately increase

or decrease with the level of output produced. They are also called as prime costs or direct

costs.



8. Accounting costs and economic costs. Accounting costs are those costs which are already incurred on the production of a particular commodity. It includes only the acquisition costs. They are the actual costs involved in the making of a commodity. On the other hand, economic costs are those costs that are to be incurred by an entrepreneur on various alternative programs. It involves the application of opportunity costs

in decision making.

5.3.3 Determinants Of Costs Cost behavior is the result of many factors and forces. But it is very difficult to determine in

general the factors influencing the cost as they widely differ from firm to firm and even industry to

industry. However, economists have given some factors considering them as general determinants

of costs. They have enough importance in modern business set up and decision making process.

The following factors deserve our attention in this connection.

1. Technology

Modern technology leads to optimum utilization of resources, avoid all kinds of wastages, saving of

time, reduction in production costs and resulting in higher output. On the other hand, primitive

technology would lead to higher production costs. 2. Rate of output: (the degree of utilization of the plant and machinery)

Complete and effective utilization of all kinds of plants and equipments would reduce production

costs and under utilization of existing plants and equipments would lead to higher production costs. 3. Size of Plant and scale of production

Generally speaking big companies with huge plants and machineries organize production on large

scale basis and enjoy the economies of scale which reduce the cost per unit. 4. Prices of input factors

. Higher market prices of various factor inputs result in higher cost of production and vice

versa. 5. Efficiency of factors of production and the management

Higher productivity and efficiency of factors of production would lead to lower production

costs and viceversa.



6. Stability of output

Stability in production would lead to optimum utilization of the existing capacity of plants and

equipments. It also brings savings of various kinds of hidden costs of interruption and learning

leading to higher output and reduction in production costs. 7. Law of returns

Increasing returns would reduce cost of production and diminishing returns increase cost. 8. Time period

In the short run, cost will be relatively high and in the long run, it will be low as it is possible to make

all kinds of adjustments and readjustments in production process.

Thus, many factors influence cost of production of a firm.

5.3.4 CostOutput Relationship: Cost Function. Cost and output are correlated. Cost output relations play an important role in almost all business

decisions. It throws light on cost minimization or profit maximization and optimization of output. The relation between the cost and output is technically described as the “COST FUNCTION”. The

significance of costoutput relationship is so great that in economic analysis the cost function usually

refers to the relationship between cost and rate of output alone and we assume that all other

independent variables are kept constant. Mathematically speaking TC = f (Q) where TC = Total cost

and Q stands for output produced.

However, cost function depends on three important variables. 1 Production function

If a firm is able to produce higher output with a little quantity of inputs, in that case, the cost function

becomes cheaper and viceversa. 2. The market prices of inputs

If market prices of different factor inputs are high in that case, cost function becomes higher and vice

versa. 3. Period of time

Cost function becomes cheaper in the long run and it would be relatively costlier in the short run. Types of cost function.

Generally speaking there are two types of cost functions.

1. Short run cost function.



2. Long run cost function. 5.3.5. CostOutput Relation Ship And Cost Curves In The ShortRun.

It is interesting to note that the relationship between the cost and output is different at two different

periods of time i.e. shortrun and long run. Generally speaking, cost of production will be relatively

higher in the shortrun when compared to the long run. This is because a producer will get enough

time to make all kinds of adjustments in the productive process in the long run than in the short run.

When cost and output relationship is represented with the help of diagrams, we get short run and

long run cost curves of the firm. Now we shall make a detailed study of cost out put relations both in

the shortrun as well as in the long run.

MEANING OF SHORT RUN Shortrun is a period of time in which only the variable factors can be varied while fixed factors like plant, machinery etc remains constant. Hence, the plant capacity is fixed in the short

run. The total number of firms in an industry will remain the same. Time is insufficient either for the

entry of new firms or exit of the old firms. If a firm wants to produce greater quantities of output, it can

do so only by employing more units of variable factors or by having additional shifts, or by having

over time work for the existing labor force or by intensive utilization of existing stock of capital assets

etc. Hence, short run is defined as a period where adjustments to changed conditions are only

partial.

The short run cost function relates to the short run production function. It implies two sets of input

components – (a) fixed inputs and (b) variable inputs. Fixed inputs are unalterable. They remain

unchanged over a period of time. On the other hand, variable factors are changed to vary the output

in the short run. Thus, in the short period some inputs are fixed in amount and a firm can expand or

contract its output only by changing the amounts of other variable inputs. The costoutput

relationship in the short run refers to a particular set of conditions where the scale of operation is

limited by the fixed plant and equipment. Hence, the costs of the firm in the short run are divided into

fixed cost and variable costs. We shall study these two concepts of costs in some detail 1. Fixed costs These costs are incurred on fixed factors like land, buildings, equipments, plants, superior type of labor, top management etc. Fixed costs in the short run remain constant because the firm does not change the size of plant and the amount of fixed factors employed. Fixed costs



do not vary with either expansion or contraction in output. These costs are to be incurred by a

firm even output is zero. Even if the firm close down its operation for some time temporarily in the

short run, but remains in business, these costs have to be borne by it. Hence, these costs are

independent of output and are referred to as unavoidable contractual cost.

Prof. Marshall called fixed costs as supplementary costs. They include such items as contractual rent

payment, interest on capital borrowed, insurance premiums, depreciation and maintenance

allowances, administrative expenses like manager’s salary or salary of the permanent staff, property

and business taxes, license fees, etc. They are called as overhead costs because these costs are to

be incurred whether there is production or not. These costs are to be distributed on each unit of

output produced by a firm. Hence, they are called as indirect costs. 2. Variable costs The cost corresponding to variable factors are discussed as variable costs. These costs are incurred on raw materials, ordinary labor, transport, power, fuel, water etc, which directly vary in the short run. Variable costs directly and proportionately increase or decrease with the level of

output. If a firm shuts down for some time in the short run; then it will not use the variable factors of

production and will not therefore incur any variable costs. Variable costs are incurred only when

some amount of output is produced. Total variable costs increase with increase in the level of

production and viceversa. Prof. Marshall called variable costs as prime costs or direct costs because

the volume of output produced by a firm depends directly upon them.

It is clear from the above description that production costs consist of both fixed as well as variable

costs. The difference between the two is meaningful and relevant only in the short run. In the long

run all costs become variable because all factors of production become adjustable and variable in the

long run.

However, the distinction between fixed and variable costs is very significant in the short run because

it influences the average cost behavior of the firm. In the short run, even if a firm wants to close down

its operation but wants to remain in business, it will have to incur fixed costs but it must cover at least

its variable costs.

Costoutput relationship and nature and behavior of cost curves in the short run

In order to study the relationship between the level of output and corresponding cost of

production, we have to prepare the cost schedule of the firm. A costschedule is a statement of a



variation in costs resulting from variations in the levels of output. It shows the response of cost to changes in output. A hypothetical cost schedule of a firm has been represented in the

following table.

Output

in Units

TFC TVC TC AFC AVC AC MC

0 360 360

1 360 180 540 360 180 540 180

2 360 240 600 180 120 300 60

3 360 270 630 120 90 210 30

4 360 315 675 90 78.75 168.75 45

5 360 420 780 72 84 156 105

6 360 630 990 60 105 165 210

On the basis of the above cost schedule, we can analyse the relationship between changes in the

level of output and cost of production. If we represent the relationship between the two in a

geometrical manner, we get different types of cost curves in the short run. In the short run, generally

we study the following kinds of cost concepts and cost curves. 1. Total fixed cost (TFC) TFC refers to total money expenses incurred on fixed inputs like plant, machinery, tools & equipments in the short run. Total fixed cost corresponds to the fixed inputs in the short run

production function. TFC remains the same at all levels of output in the short run. It is the same

when output is nil. It indicates that whatever may be the quantity of output, whether 1 to 6 units, TFC

remain constant. The TFC curve is horizontal and parallel to OXaxis, showing that it is constant

regardless of out put per unit of time. TFC starts from a point on Yaxis indicating that the total fixed

cost will be incurred even if the output is zero. In our example, Rs 30000 is TFC. It is obtained by

summing up the product or quantities of the fixed factors multiplied by their respective unit price.



TFC = TC TVC.

2. Total variable cost (TVC) TVC refers to total money expenses incurred on the variable factors inputs like raw

materials, power, fuel, water, transport and communication etc, in the short run. Total variable

cost corresponds to variable inputs in the short run production function. It is obtained by summing up

the production of quantities of variable inputs multiplied by their prices. The formula to calculate TVC

is as follows. TVC = TCTFC. TVC = f (Q) i.e. TVC is an increasing function of out put. In other

words TVC varies with output. It is nil, if there is no production. Thus, it is a direct cost of output.

TVC rises sharply in the beginning, gradually in the middle and sharply at the end in accordance with

the law of variable proportion. The law of variable proportion explains that in the beginning to obtain a

given quantity of output, relative variation in factors needed are in less proportion, but after a point

when the diminishing returns operate, variable factors are to be employed in a larger proportion to

increase the same level of output.

TVC curve slope upwards from left to right. TVC curve rises as output is expanded. When out put is

Zero, TVC also will be zero. Hence, the TVC curve starts from the origin.

TFC

Y

X 0

300

Cost of production

Output



3. Total cost (TC) The total cost refers to the aggregate money expenditure incurred by a firm to produce a given quantity of output. The total cost is measured in relation to the production function by

multiplying the factor prices with their quantities. TC = f (Q) which means that the T.C. varies with

the output. Theoretically speaking TC includes all kinds of money costs, both explicit and implicit

cost. Normal profit is included in the total cost as it is an implicit cost. It includes fixed as well as

variable costs. Hence, TC = TFC +TVC.

TC varies in the same proportion as TVC. In other words, a variation in TC is the result of variation in

TVC since TFC is always constant in the short run.

The total cost curve is rising upwards from left to right. In our example the TC curve starts form Rs.

30000 because even if there is no output, TFC is a positive amount. TC and TVC have same shape

Cost of production

300

Y

x Output

TFC

0

Cost of

production

TVC = TC TFC

TVC

X Output 0

Y

TC = TFC + TVC TC



because an increase in output increases them both by the same amount since TFC is constant. TC

curve is derived by adding up vertically the TVC and TFC curves. The vertical distance between

TVC curve and TC curve is equal to TFC and is constant throughout because TFC is constant. 4. Average fixed cost (AFC) Average fixed cost is the fixed cost per unit of output. When TFC is divided by total units of out put AFC is obtained, Thus, AFC = TFC/Q

AFC and output have inverse relationship. It is higher at smaller level and lower at the higher levels

of output in a given plant. The reason is simple to understand. Since AFC = TFC/Q, it is a pure

mathematical result that the numerator remaining unchanged, the increasing denominator causes

diminishing product. Hence, TFC spreads over each unit of out put with the increase in output.

Consequently, AFC diminishes continuously. This relationship between output and fixed cost is

universal for all types of business concerns.

The AFC curve has a negative slope. The curve slopes downwards throughout the length. The AFC

curve goes very nearer to X axis, but never touches axis. Graphically it will fall steeply in the

beginning, gently in middle and tend to become parallel to OXaxis. Mathematically speaking as

output increases, AFC diminishes. But AFC will never become zero because the TFC is a positive

amount. AFC will never fall below a minimum amount because in the short run, plant capacity is

fixed and output cannot be enlarged to an unlimited extent. 5. Average variable cost: (AVC) The average variable cost is variable cost per unit of output. AVC can be computed by

dividing the TVC by total units of output. Thus AVC = TVC/Q. The AVC will come down in the

beginning and then rise as more units of output are produced with a given plant. This is because as

Cost of P

roduction

Output X

Y

AFC

0



we add more units of variable factors in a fixed plant, the efficiency of the inputs first increases and

then it decreases.

The AVC curve is a Ushaped cost curve. It has three phases. Page 198 ( B.A)

a. Decreasing phase

In the first phase from A to B, AVC declines, As output expands, AVC declines because when we

add more quantity of variable factors to a given quantity of fixed factors, output increases more

efficiently and more than proportionately due to the operation of increasing returns. b. Constant phase

In the II phase, i.e. at B, AVC reaches its minimum point. When the proportion of both fixed and

variable factors are the most ideal, the output will be the optimum. Once the firm operates at its

normal full capacity, output reaches its zenith and as such AVC will become the minimum. c. Increasing phase

In the III phase, from B to C, AVC rises when once the normal capacity is crossed, the AVC

rises sharply. This is because additional units of variables factors will not result in more than

proportionate output. Hence, greater output may be obtained but at much greater AVC. The old

proverb “Too many cooks spoil the broth” aptly applies to this III stage. It is clear that as long as

increasing returns operate, AVC falls and when diminishing returns set in, AVC tends to increase.

6. Average total cost (ATC) or Average cost (AC) Ac refers to cost per unit of output. AC is also known as the unit cost since it is the cost per unit of output produced. AC is the sum of AFC and AVC. Average total cost or average cost is

obtained by dividing the total cost by total output produced. AC = TC/Q Also AC is the sum of AFC

and AVC.

Cost of production

AVC

AVC = TVC / Q

• B X

Y

0 Output

A C



In the short run AC curve also tends to be Ushaped. The combined influence of AFC and AVC

curves will shape the nature of AC curve.

As we observe, average fixed cost begin to fall with an increase in output while average variable

costs come down and rise. As long as the falling effect of AFC is much more than the rising effect of

AVC, the AC tends to fall. At this stage, increasing returns and economies of scale operate and

complete utilization of resources force the AC to fall.

When the firm produces the optimum output, AC becomes minimum. This is called as least – cost

output level. Again, at the point where the rise in AVC exactly counter balances the fall in AFC, the

balancing effect causes AC to remain constant.

In the third stage when the rise in average variable cost is more than drop in AFC, then the AC

shows a rise, When output is expanded beyond the optimum level of output, diminishing returns set

in and diseconomies of scale starts operating. At this stage, the indivisible factors are used in wrong

proportions. Thus, AC starts rising in the third stage.

The short run AC curve is also called as “Plant curve”. It indicates the optimum utilization of a

given plant or optimum plant capacity. 7. Marginal Cost (MC) Marginal cost may be defined as the net addition to the total cost as one more unit of output

is produced. In other words, it implies additional cost incurred to produce an additional unit.

For example, if it costs Rs. 100 to produce 50 units of a commodity and Rs. 105 to produce 51 units,

Cost of production

AC

ATC = AFC + AVC

• B X

Y

0 Output

A

C



then MC would be Rs. 5. It is obtained by calculating the change in total costs as a result of a

change in the total output. Also MC is the rate at which total cost changes with output. Hence, MC =

∆ TC / ∆ TQ. Where ∆ TC stands for change in total cost and ∆ TQ stands for change in total

output. Also MCn = TCn –TC n1 It is necessary to note that MC is independent of TFC and it is directly related to TVC as we calculate

the cost of producing only one unit. In the short run, the MC curve also tends to be Ushaped.

The shape of the MC curve is determined by the laws of returns. If MC is falling, production will be

under the conditions of increasing returns and if MC is rising, production will be subject of diminishing

returns.

The table indicates the relationship between AC & MC

Output in Units TC in Rs. AC in Rs. Difference in Rs.

MC

1 150 150

2 190 95 40

3 220 73.3 30

4 236 59 16

5 270 54 34

MC A

X

Y

0

Cost of production

C B •

Output



6 324 54 54

7 415 59.3 91

8 580 72.2 165

Relation between AC and MC

From the diagram it is clear that:

1. Both MC and AC fall at a certain range of output and rise afterwards. 2. When AC falls, MC also falls but at certain range of output MC tends to rise even though AC

continues to fall. However, MC would be less than AC. This is because MC is attributed to a

single unit where as in case of AC, the decreasing AC is distributed over all the units of output

produced.

3. So long as AC is falling, MC is less than AC. Hence, MC curve lies below AC curve. It indicates that fall in MC is more than the fall in AC. MC reaches its minimum point before AC reaches its

minimum.

MC

AC

Cost

Y

X Output

• AC=MC



4. When AC is rising, after the point of intersection, MC will be greater than AC. This is because in

case of MC, the increasing MC is attributed to a single unit, where as in case of AC, the

increasing AC is distributed over all the output produced.

5. So long as the AC is rising, MC is greater and AC. Hence, AC curve lies to the left side of the MC curve. It indicates that rise in MC is more than the rise in AC.

6. MC curve cuts the AC curve at the minimum point of the AC curve. This is because, when MC decreases, it pulls AC down and when MC increases, it pushes AC up. When AC is at its

minimum, it is neither being pulled down or being pushed up by the MC. Thus, When AC is

minimum, MC = AC. The point of intersection indicates the least cost combination point or the

optimum position of the firm. At output Q the firm is working at its “Optimum Capacity” with

lowest AC. Beyond Q, there is scope for “Maximum Capacity” with rising cost.

5.3.6 Cost Output Relationship In The Long Run

Long run is defined as a period of time where adjustments to changed conditions are complete. It is actually a period during which the quantities of all factors, variable as well as fixed

factors can be adjusted. Hence, there are no fixed costs in the long run. In the short run, a firm has

to carry on its production within the existing plant capacity, but in the long run it is not tied up to a

particular plant capacity. If demand for the product increases, it can expand output by enlarging its

plant capacity. It can construct new buildings or hire them, install new machines, employ

administrative and other permanent staff. It can make use of the existing as well as new staff in the

most efficient way and there is lot of scope for making indivisible factors to become divisible factors.

On the other hand, if demand for the product declines, a firm can cut down its production

permanently. The size of the plant can also be reduced and other expenditure can be minimized.

Hence, production cost comes down to a greater extent in the long run.

As all costs are variable in the long run, the total of these costs is total cost of production. Hence, the distinction between fixed and variables costs in the total cost of production will disappear in the long run. In the long run only the average total cost is important and considered in

taking long term output decisions.

Long run average cost is the long run total cost divided by the level of output. In brief, it is the per unit

cost of production of different levels of output by changing the size of the plant or scale of production.



The long run cost – output relationship is explained by drawing a long run cost curve through short –

run curves as the long period is made up of many short – periods as the day is made up of 24 hours

and a week is made out of 7 days. This curve explains how costs will change when the scale of

production is varied.

The long run cost curves are influenced by the laws of return to scale as against the short run cost

curves which are subject to the working of law of variable proportions.

In the short run the firm is tied with a given plant and as such the scale of operation remains

constant. There will be only one AC curve to represent one fixed scale of output in the short run. In

the long run as it is possible to alter the scale of production, one can have as many AC curves as

there are changes in the scale of operations.

In order to derive LAC curve, one has to draw a number of SAC curves, each curve representing a

particular scale of output. The LAC curve will be tangential to the entire family of SAC cures. It

means that it will touch each SAC curve at its minimum point.

Q X Q

0

Cost of P

roduction SAC 1

SAC 2

SAC 3

SAC 4 SAC 5

LAC

Output

Y



Production cost difference in the short run and long run

In the diagram, the LAC curve is drawn on the basis of three possible plant sizes.

Consequently, we have three different SAC curves – SAC1, SAC2 and SAC3. They represent three

different scales of output. For output OM3 the AC will be L2M2 in the short run as well as the long

run.

When output is to be expanded to OM3, it can be obtained at a higher average cost of

production. K3, M3 is the short run AC because, scale of production would remain constant in the

short run. But the same output of OM3 can be produced at a lower AC of L3M3 in the long run since

the scale of production can be modified according to the requirements. The distance between K3L3

represent difference between the cost of production in the short run and long run.

Similarly, when output is contracted to OM1 in the short run, K1M1 will become the short run AC

and L1M1 will be the long run AC. Hence, K1L1 indicates the differences between short run and

long run cost of production. If we join points L1, L2 and L3 we get LAC curve.

Important features of long run AC curves

1. Tangent curve

Different SAC curves represent different operational capacities of different plants in the short run.

LAC curve is locus of all these points of tangency. The SAC curve can never cut a LAC curve

though they are tangential to each other. This implies that for any given level of output, no SAC curve

X M3 M2 M1

• L3 •

L2

• L1

LAC

SAC 1 SAC 3 SAC 2

Y

0

• K 1 • K 3

Cost of P

roduction

Output



can ever be below the LAC curve. Hence, SAC cannot be lower than the LAC in the ling run. Thus,

LAC curve is tangential to various SAC curves. 2. Envelope curve

It is known as Envelope curve because it envelopes a group of SAC curves appropriate to different

levels of output. 3. Flatter Ushaped or dishshaped curve. The LAC curve is also U shaped or dish shaped cost curve. But It is less pronounced and much

flatter in nature. LAC gradually falls and rises due to economies and diseconomies of scale. 4. Planning curve. The LAC cure is described as the Planning Curve of the firm because it represents the least cost of

producing each possible level of output. This helps in producing optimum level of output at the

minimum LAC. This is possible when the entrepreneur is selecting the optimum scale plant.

Optimum scale plant is that size where the minimum point of SAC is tangent to the minimum point of

LAC. 5. Minimum point of LAC curve should be always lower than the minimum point of SAC curve.

This is because LAC can never be higher than SAC or SAC can never be lower than LAC. The LAC

curve will touch the optimum plant SAC curve at its minimum point.

A rational entrepreneur would select the optimum scale plant. Optimum scale plant is that size at

which SAC is tangent to LAC, such that both the curves have the minimum point of tangency. In the

diagram, OM2 is regarded as the optimum scale of output, as it has the least per unit cost. At OM2

output LAC = SAC.

LAC curve will be tangent to SAC curves lying to the left of the optimum scale or right side of the

optimum scale. But at these points of tangency, neither LAC is minimum nor will SAC be minimum.

SAC curves are either rising or falling indicating a higher cost

Managerial Use of LAC

The study of LAC is of greater importance in managerial decision making process.

1. It helps the management in the determination of the best size of the plant to be constructed or when a new one is introduced in getting the minimum cost output for a given plant. But it is

interested in producing a given output at the minimum cost.



2. The LAC curve helps a firm to decide the size of the plant to be adopted for producing the given output. For outputs less than cost lowering combination at the optimum scale i.e., when the firm

is working subject to increasing returns to scale, it is more economical to under use a slightly

large plant operating at less than its minimum cost – output than to over use smaller unit.

Conversely, at output beyond the optimum level, that is when the firm experience decreasing

return to scale, it is more economical to over use a slightly smaller plant than to under use a

slightly larger one. Thus, it explains why it is more economical to over use a slightly small plant

rather than to under use a large plant.

3. LAC is used to show how a firm determines the optimum size of the plant. An optimum size of plant is one that helps in best utilization of resources in the most economical manner.

Long Run Marginal cost

A longrun marginal cost curve can be derived from the longrun average cost curve. Just as the

SMC is related to the SAC, similarly the LMC is related to the LAC and, therefore, we can derive the

LMC directly from the LAC. In the diagram we have taken three plant sizes (for the sake of simplicity)

and the corresponding three SAC and SMC curves. The LAC curve is drawn by enveloping the family

SMC 1

SMC 2

SMC 3

LMC LAC

SAC 1

SAC 2

SAC 3

D

C

A

B

E

X 0 N Q R Output

Y

Cost of Production



of SAC curves. The points of tangency between the SAC and the LAC curves indicate different

outputs for different plant sizes.

If the firm wants to produce ON output in the long run, it will have to choose the plant size

corresponding to SAC1. The LAC curve is tangent to SAC1 at point A. For ON output, the average

cost is NA and the corresponding marginal cost is NB If LAC curve is tangent to SAC1 curve at point

A, the corresponding LMC curve will have to be equal to SMC1 curve at point B. The LMC will pass

through point B. In other words, where LAC is equal to SAC curve (for a given output) the LMC will

have to be equal to a given SMC.

If output OQ is to be produced in the long run, it will be done at point c which is the point of tangency

between SAC2 and the LAC. At point C, the short –run average cost (SAC2) and the shortrun

marginal cost (SMC2) are equal and, therefore, the LAC for output OQ is QC and the corresponding

LMC is also QC. The LMC curve will, therefore pass through point C.

Finally, for output OR,at point D the LAC is tangent to SAC3. For OR output at point E LMC is

passing through SMC3. By connecting points B ,C and E, we can draw the longrun marginal cost

curve.

COST OF PRODUCTION: FORMULAS

♦ TC = cost per unit x total production. Or TC = TFC + TVC

♦ TFC = TC TVC or AFC x Q

♦ TVC = TC – TFC or AVC x Q or addition of MC

♦ AFC = AC – AVC or TFC/Q

♦ AVC = AC – AFC or TVC/Q

♦ AC = AFC + AVC or TC/Q

♦ MC = TCn TCn1 or ∆ TC / ∆ TQ.


1. Opportunity cost of anything is the alternative that has been _____

2. Marginal cost deals with changes in cost of ______ unit where as incremental cost deals with

changes in cost of ________.

3. AC minus AVC would give us _________



4. Total cost include ___________ profits.

5. Marginal cost is associated with _________ costs.

6. In the long run all cost are ______________.

5.4 Summary

In this unit5 we have discussed about the meaning of production, production function and its

managerial uses. Production in economics implies transformation of inputs into outputs for our final

consumption. Production function explains the quantitative relationship between the amounts of

inputs used to.. get a particular physical quantity of outputs. The ratios between the two quantities

are of great importance to a producer to take his decisions in the production process. There are two

kinds of production functions short run and long run. In case of short run production function we

come across a change in either one or two variable factor inputs while all other inputs are kept

constant. The law of variable proportion explain how there will be variations in the quantity of output

when there is change in only one variable factor inputs while all other inputs are kept constant. On

the other hand IsoQuants and Isocost curves explain how there will be changes in output when only

two variable inputs are changed while all other inputs are kept constant. Under long run production

function, the laws of returns to scale explain changes in output when all inputs, both variable as well

as fixed changes in the same proportion. Economies of scale give information about the various

benefits that a firm will get when it goes for large scale production. Economies of scope on the other

hand tells us how there will be certain specific advantages when one firm produces more than two

products jointly than two or three firms produce them separately. Diseconomies of scale and

diseconomies of scope tells us that there are certain limitations to expansion in output Cost analysis

on the other hand, indicates the various amounts of costs incurred to produce a particular quantity of

output in monetary terms. The various kinds of cost concepts help a manager to take right decisions.

Cost function explains the relationship between the amounts of costs to be incurred to produce a

particular quantity of output. Short run cost function gives information about the nature and behavior

of various cost curves. Long run cost function tells us how it is possible to obtain more output at

lower costs in the long run. Thus, the knowledge of both production function and cost functions help

a business executive to work out the best possible factor combinations to maximize output with

minimum costs.



Terminal Questions

1. Define production function and distinguish between shortrun and long run production function.

2. Discuss the user of production function.

3. Explain the law of variable proportions

4. Explain how a product would reach equilibrium position with the heap of ISO Quants and ISO

cost curve.

5. Discuss any one laws of returns to scale with example.

6. Explain either various internal or external economics of scale.

7. Explain the concept of economic of scope with suitable illustration.

8. Give a suit description of

a. Implicit and explicit cost

b. Actual and opportunity cost

9. Discuss the various determinants of costs.

10. Explain cost output relationship with reference to

a. Total fixed cost to output

b. Total variable cost to output

c. Total cost to output

11. Explain features of LAC curve with a diagram.

Answer to Self Assessment Questions Self Assessment Questions 1

1. New utilities, addition.

2. Technological, engineering.

3. Variable.

4. Highest

5. Various alternative, particular

6. Demanding returns

7. Firms industry

8. One product jointly




1. foregone

2. one , a group of units

3. AFC

4. normal

5. Variable

6. Variable

Answer to Terminal Questions

1. Refer to unit 5.2







8. Refer to unit 5.2.2




Date post:	23-Nov-2014
Category:	Documents
Upload:	raj-naik
View:	59 times
Download:	0 times

5-Production-Analysis

Documents